ON Semiconductor FL7760LED1GEVK Evaluation Board User Manual
- June 8, 2024
- ON Semiconductor
Table of Contents
FL7760LED1GEVK
3W SPI Controllable LED
Driver Evaluation Board
www.onsemi.com
EVAL BOARD USER’S MANUAL
FL7760LED1GEVK
Evaluation Board
OVERVIEW
This manual covers the specification, theory of operation, testing and
construction of the FL7760LED1GEVK demonstration kit. The FL7760 kit
demonstrates a 1 A buck LED driver intended for a single high−power LED. The
SPI (Serial Peripheral Interface) bus does both analog and PWM dimming. The
kit includes a load/SPI interface board to facilitate operation of the driver.
The driver can be driven independently from any SPI controller. The nominal
input voltage is 12 V.
Table 1. SPECIFICATIONS
Input Voltage| 10.8 V dc − 13.2 V dc|
---|---|---
Output Voltage| 2.5 V dc − 5.0 V dc|
Output Current| 1 A| Max
Output Ripple| 40 mA| P−P
Efficiency| 85%| Typ.
Switching Frequency| 200 kHz|
Rise/Fall Time| < 20µs|
Dimming Interface| SPI|
Dimming Resolution| 8 bits|
PCB Size| 30 mm × 30 mm|
The key features of this demo kit include:
- Low Parts Count
- Single Sided Assembly
- Small Footprint
- Very Fast Rise/Fall Times
- SPI Dimming Control for Analog and PWM Dimming
- 12 V Operation
- Integrated Thermal Shutdown and UVLO
THEORY OF OPERATION
Power Stage
The power stage is a CCM inverted buck converter. The output inductor sets the
switching frequency because the control operates in hysteretic control mode.
The peak and valley current are fixed percentages of the current reference.
This fixes the inductor ripple current and eliminates the need for closed loop
compensation. A novel high side current sense enables direct accurate control
of the output current.
FL7760LED1GEVK
HV Start
The FL7760 supplies its own Vcc power greatly simplifying implementation. The
input voltage range is 8 V − 70V. The internal Vcc regulates to 5 V ± 10%. The
internal Vcc supplies a 3.3 V LDO for powering the DAC. The regulator and DAC
draw less than 1mA combined.
Dimming
The FL7760 dim input controls both amplitude and on/off control. This makes
the dim interface controllable by analog, PWM, or both at the same time. The
DAC has an output range of 0 V – 3.3 V for 8 bits of resolution. A dim signal
below 0.5 V turns off the output and a dim signal above 3 V is 100% output.
Protection
Thermal Protection
The thermal protection is built into the FL7760 and shuts down the FL7760 when
the die temperature exceeds 150°C.
OVP
The output voltage is inherently limited to be less than or equal to Vin. As
such, no OVP is required due this inherent limitation.
Load Board Operation
The load board connects to the LED driver via an 8 conductor FPC cable. The
FPC cable makes a simple and convenient interconnection. The load board serves
2 major functions: 1) provide an easy connection to an LED load 2) provide a
USB−SPI bridge for computer control of the LED driver.
The daughter card on the load has a mini USB−A connection for attachment to
your computer. See the test procedure for details of the setup of the SPI
terminal application.
SCHEMATIC
FL7760LED1GEVK
Table 2. BILL OF MATERIAL
Qty| Reference| Part| Distributor| Dist. P/N|
Manufacturer| Mfr_PN
---|---|---|---|---|---|---
4| C1, C2, C3, C4| 4.7 uF 25 V| Digikey| 1276−3178−1−ND| Samsung|
CL31B475KAHNNWE
1| C5| 1 uF| Digikey| 587−3247−1−ND| Taiyo Yuden| UMK107AB7105KA−T
1| D1| FSV330AF| ON
Semiconductor
| FSV330AFCT−ND| ON
Semiconductor| FSV330AF
1| J1| CONN JACK PWR| Digikey| 732−5929−1−ND| Wurth| 694106106102
1| J3| FH12−8S−0.5SH(55)| Digikey| H124618CT−ND| Hirose| FH12−8S−0.5SH(55)
1| L1| 4.7 uH| Digikey| 445−6760−1−ND| TDK| MLZ2012N4R7LT000
1| L2| 4.7 uH| Digikey| 732−2197−1−ND| Wurth| 7447715470
1| Q1| MGSF1N03LT1G| ON
Semiconductor| MGSF1N03LT1GOSCT−ND| ON
Semiconductor| MGSF1N03LT1G
1| R1| 200 m| Digikey| CSR1206FKR200CT−ND| Stackpole| CSR1206FKR200
4| R2, R3, R4, R5| 10 k| Digikey| 311−10.0KLRCT−ND| Yageo| RC0402FR−0710KL
1| U1| FL7760| ON
Semiconductor| FL7760| ON
Semiconductor| FL7760
1| U2| DAC081S101CIMK/NOPB| Digikey| DAC081S101CIMK/NOPBCT−ND| TI|
DAC081S101CIMK/NOPB
1| U3| TLV71333PDBVR| Digikey| 296−35591−1−ND| TI| TLV71333PDBVR
5| SCLK1, MOSI1, Gnd1, CS1, Gnd2| Test Point| Digikey| 952−2264−1−ND| Harwin|
S2751−46R
1| C1| 10 uF| Digikey| 1276−6641−1−ND| Samsung| CL31B106MOHNNNE
1| J2| 982660083| Digikey| WM14102−ND| Molex| 982660083
2| J3, J4| CONN PCB 7| Digikey| S7040−ND| Sullins| PPPC071LFBN−RC
1| J5| FH12−8S−0.5SH(55)| Digikey| H124618CT−ND| Hirose| FH12−8S−0.5SH(55)
2| LED−1, LED+1| MTG_Hole| Digikey| 3267| Pomona| 3267
1| U1| MCP2210| Digikey| ADM00419−ND| Microchip| ADM00419
TEST PROCEDURE
Equipment Needed
DC Source − 12 V ± 5% @ 1 A
2 − DC Voltmeter − 300 V dc minimum 0.1% accuracy or better
2 − DC Ammeter − 1 A dc minimum 0.1% accuracy or better
LED Load − 2.5 V − 5.0 V @ 1.0 A
The Connections
- Connect the LED load board to the LED driver using the FPC cable provided in the kit.
- Connect red (+) and black (−) leads through the ammeter to the LED load.
- Connect a 12 V dc source to the input power connector.
NOTE: Unless otherwise specified, all voltage measurements are taken at
the terminals of the UUT.
Functional Test Procedure
- Set the LED Load for 3.5 V output.
- Set the input voltage to 12 V.
- Measure input voltage and current.
- Measure output voltage and current.
Regulation
See Table 3.
Table 3. REGULATION
DAC Data| Iout Target| Output Current| Output Voltage|
Input Voltage| Input Current
---|---|---|---|---|---
00 00| 0 A| | | |
0F F0| 1 A ± 5%| | | |
07 00| 0.5 A ± 5%| | | |
TEST DATA
|
---|---
|
---|---
THERMAL IMAGE
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